FastR Grid: support gpar containing vectors

...com/oracle/truffle/r/library/fastrGrid/DoSetViewPort.java

...om/oracle/truffle/r/library/fastrGrid/DrawArrowsNode.java

...rary/src/com/oracle/truffle/r/library/fastrGrid/GPar.java

...com/oracle/truffle/r/library/fastrGrid/GridLinesNode.java

...src/com/oracle/truffle/r/library/fastrGrid/GridState.java

.../com/oracle/truffle/r/library/fastrGrid/GridTextNode.java

...src/com/oracle/truffle/r/library/fastrGrid/GridUtils.java

...y/src/com/oracle/truffle/r/library/fastrGrid/LCircle.java

.../src/com/oracle/truffle/r/library/fastrGrid/LConvert.java

...racle/truffle/r/library/fastrGrid/LInitViewPortStack.java

...y/src/com/oracle/truffle/r/library/fastrGrid/LPoints.java

...ary/src/com/oracle/truffle/r/library/fastrGrid/LRect.java

...src/com/oracle/truffle/r/library/fastrGrid/LSegments.java

...rary/src/com/oracle/truffle/r/library/fastrGrid/Unit.java

...ffle/r/library/fastrGrid/device/BufferedJFrameDevice.java

.../oracle/truffle/r/library/fastrGrid/device/GridColor.java